And now to florida, where it is day three of the trayvon martin case. George zimmerman on trial. The last person to talk to trayvon martin, his friend, took the stand. And abc's matt gutman was there for the intense and dramatic moment. Reporter: Rachel jeantel described the raw, final moments of trayvon martin's life as she says she heard them in his last phone call. Tell us, if you can, what he described happening? A man was watching him. Reporter: The prosecution a asking its star witness about the man she said martin spotted following him. He said the man looked creepy? Reporter: The man was neighborhood watchman george zimmerman now facing a second degree murder charge. He looked like a creepy -- Reporter: While her testimony was often hard to understand -- if you can't understand, just raise your hand. Reporter: The emotion in court, self-ette. Martin's father weeping. She was on the phone for the critical moment of confrontation between zimmerman and martin. He said, "why are you following me for?" Then I heard a hard breathing man saying what you doing around here? Reporter: Then the phone went dead. Under cross examination she admitted she never reported the incident to police and never went to martin's funeral. You got to understand -- you the last person to talk to the person and he die on the phone? After you talk to him? Reporter: Throughout the day, the jurors were riveted, and as the defense grilled her, she became increasingly combative. We're likely to see more of that tomorrow, as her testimony continues. Diane?

This transcript has been automatically generated and may not be 100% accurate.

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